Received Power Calculator for Computer

Received Power Formula:

\[ P_r = P_t \times G_t \times G_r \times \left(\frac{\lambda}{4 \pi d}\right)^2 \]

Transmitted Power (P_t):

Watts (W)

Transmitter Gain (G_t):

Receiver Gain (G_r):

Wavelength (λ):

meters (m)

Distance (d):

meters (m)

Received Power (P_r):

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1. What is a Received Power Calculator?

Definition: This calculator estimates the power received at a wireless communication receiver based on the Friis transmission equation.

Purpose: It helps engineers and technicians determine signal strength in wireless systems, computer networks, and radio communications.

2. How Does the Calculator Work?

The calculator uses the Friis transmission equation:

\[ P_r = P_t \times G_t \times G_r \times \left(\frac{\lambda}{4 \pi d}\right)^2 \]

Where:

\( P_r \) — Received power (Watts)
\( P_t \) — Transmitted power (Watts)
\( G_t \) — Transmitter antenna gain (dimensionless)
\( G_r \) — Receiver antenna gain (dimensionless)
\( \lambda \) — Wavelength (meters)
\( d \) — Distance between antennas (meters)

Explanation: The equation calculates how much power is received based on transmitted power, antenna gains, wavelength, and distance.

3. Importance of Received Power Calculation

Details: Accurate received power estimation is crucial for designing reliable wireless communication systems and determining coverage areas.

4. Using the Calculator

Tips: Enter all parameters with positive values. Default gains are 1 (isotropic antennas). Wavelength can be calculated as \( \lambda = c/f \) where c is speed of light and f is frequency.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for distance and wavelength?
A: Both distance and wavelength should be in meters for consistent results.

Q2: How do I convert frequency to wavelength?
A: Wavelength (m) = Speed of light (3×10⁸ m/s) / frequency (Hz).

Q3: What are typical antenna gain values?
A: Isotropic antennas have gain of 1, while directional antennas might have gains from 2-20 or more.

Q4: Does this account for real-world losses?
A: The basic Friis equation doesn't include atmospheric absorption, multipath, or other losses.

Q5: Why is received power so small in the results?
A: The inverse square law means power decreases rapidly with distance, especially at high frequencies.